RIGID INSULATING COMPONENTS
FOR POWER GENERATION

Precision Manufacturing for the Power Gen Market

SIS supplies rigid insulating and support components for large generator assemblies, meeting tight fit, electrical insulation, and thermal resistance requirements for stator and rotor systems in both OEM builds and aftermarket repairs.

We go beyond standard machining with reverse engineering capabilities — creating CAD models directly from parts when specs aren’t available. The result: rapid repairs, solutions for legacy equipment, and performance you can count on.

From complete wedge kits to hard-to-find components, SIS delivers.

Learn more about our Rigid Fabrication Solutions for the Power Generation Industry

Stator Components

Stator Wedges

Materials:

G11, Canvas Phenolic

Application:

Secure windings in slots; minimize movement and vibration

Stator Slides

Materials:

G11

Application:

Compress ripple spring and stabilize slot contents

Binding Bands & Radial Rings

Materials:

Glass Epoxy, Polyester Composite

Application:

Reinforce winding baskets and fight electrical surges

Top & Side Ripple Springs

Materials:

Semi-conductive Glass Polyester

Application:

Maintain pressure and dissipate static charge

Cap Terminals

Materials:

Copper with Epoxy Insulation

Application:

Provide safe winding connection points

Slot Filler

Materials:

C109 (Glass Polyester), C209 (Glass Epoxy)

Application:

Fill insulation gaps inside stator slots

Side Filler/Packing

Materials:

Semi-conductive Glass Polyester, Glass Epoxy

Application:

Fill slot sides between conductor bars and iron core

Hose Mold Kits

Materials:

Silicone Rubber, Flexible Epoxy

Application:

Form and insulate stator cooling hoses

Coil Supports / Gun Stock

Materials:

G11, Phenolic, Glass Polyester

Application:

Support stator coil alignment under dynamic loading

Mounting Plates

Materials:

G10, G11

Application:

Secure stator components and accessories

Rotor Components

Creepage Blocks

Materials:

G11, Canvas Polyetser

Application:

Prevent electrical tracking between components

End Winding Blocking

Materials:

Epoxy Glass, Polyester

Application:

Stabilize rotor end tuns under stress

End Turn Insulation

Materials:

Epoxy-Coated Nomex, Glass Epoxy

Application:

Prevent electrical faults in turn-to-ring areas, corner and straight pieces

Retaining Ring Insulation

Materials:

Glass Epoxy, Teflon-Coated

Application:

Electrically isolate copper from retaining rings

Slot Armor

Materials:

Nomex, Nomex/G11 Composite, Teflon-Lined

Application:

Isolate copper turns from rotor slot metal

Slot Liner

Materials:

Nomex + G11

Application:

Protect rotor slot and isolate copper conductors

Subslot Covers

Materials:

G11

Application:

Insulate the bottom of rotor slot

Temp Wood Kits

Materials:

Laminated Wood, Phenolic

Application:

Temporary supports during maintenance or build

Space & Wedge Blocks

Materials:

G11, Phenolic, Magnetic Alloys

Application:

Maintain spacing, allow cooling, support expansion

Bushings

Materials:

G11

Application:

Provide insulated paths for leads and bore connectors

Pole Collars (Hydro)

Materials:

G10, G11, Polyester

Application:

Support and insulate rotor pole windings

Capabilities

Rigid-only CNC machining and turning (no forming or casting)

Build-to-spec kits or standalone hard-to-source parts

Materials include G10, G11, Glass Polyester, Nomex, Phenolic, and Epoxy

Tight-tolerance insulation with thermal and dielectric stability

Rapid quoting and small-to-mid production runs from a U.S.-based shop

Reverse engineering with CAD modeling and reproduction from only the original part, no specs required

Compliance Area Material Expertise

AIPC/NEMA-grade materials for generator insulation (e.g., G11, G10, C209) 

Experience supporting OEM specs, rebuild standards, and surge tolerance

RoHS, REACH, and ITAR support available upon request

Need a Quote for Power Gen Components?

Upload your part drawing or send us your BOM — we’ll machine your wedges, slides, covers, and kits to spec from compliant materials, with fast turnaround and repeatable quality.